6642941918 has 16 divisors (see below), whose sum is σ = 10490659920. Its totient is φ = 3146115456.

The previous prime is 6642941917. The next prime is 6642941923. The reversal of 6642941918 is 8191492466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642941917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288230 + ... + 310422.

It is an arithmetic number, because the mean of its divisors is an integer number (655666245).

Almost surely, 2^6642941918 is an apocalyptic number.

6642941918 is a deficient number, since it is larger than the sum of its proper divisors (3847718002).

6642941918 is a wasteful number, since it uses less digits than its factorization.

6642941918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30091.

The product of its digits is 746496, while the sum is 50.

The square root of 6642941918 is about 81504.2447851644. The cubic root of 6642941918 is about 1879.8368198113.

The spelling of 6642941918 in words is "six billion, six hundred forty-two million, nine hundred forty-one thousand, nine hundred eighteen".